Bathtub



FIG. 1 is a top view of a bathtub showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a perspective view thereof.

The broken lines showing various disclaimed regions in FIGS. 1, 4 and 6are for illustrative purposes only and form no part of the claimeddesign.

The ornamental design for a bathtub, as shown and described.